The Best Episodes Written By Sarah Dollard

The team is reeling from the shocking discovery of a mole among them, and as the Soviet plot continues unabated, it is up to Wendy to give the team the break they need. Meanwhile, when Sarah finds herself in danger, Alan is forced to make a decision that can make or break their relationship. Joe has trouble of his own when leaked information threatens the investigation and the lives of the team.

When a damsel in distress seeks haven at the hotel, Tom and Hal are attracted to her for different reasons. Alex investigates her suspicions about Captain Hatch with dangerous consequences.

The Doctor and Clara, with their old friend Rigsy, find themselves in a magical alien world, hidden on a street in the heart of London.

Jamie makes a discovery that leaves him feeling completely betrayed. Elsewhere, Ariel sends Scotty a worrying message and Rhonda realises no one can be trusted.

The team discovers a sleeper agent with terrifying connections in the US military. Faced with a formidable foe who not only appears to be a traitor, but a trained spy with access to US bases, MI5 may be out of its league. Meanwhile, Daddy is on a mission of his own to secure the safe defection of his favorite Chinese dancer. But when his assistant, Wendy, goes to carry out the admin, Bobby Waterhouse catches wind and manipulates plans to gain information about Daddy’s secret life for his own personal gain.

Diana's aunts' home gives up all sorts of secrets when Diana and Matthew pay a visit. Danger looms as Juliette breaks free from Gerbert.

Reluctant witch Diana Bishop and vampire Matthew Clairmont seek refuge in the fascinating and treacherous world of Elizabethan London. There, they must find a powerful witch to help Diana control her magic and search for the elusive Book of Life.

London, 1814. The entire city has turned out for the biggest Frost Fair in decades. But beneath the frozen Thames, revellers are disappearing, snatched through the ice and pulled into the depths where a terrifying monster lurks. Will the Doctor and Bill stop the slaughter before they too are dragged into the icy waters?

The York princesses are strategically married off to strengthen the Tudor cause. When King Henry finds himself back on the battlefield to protect his reign, Lizzie learns that the threats they face may be closer to home.

On her honeymoon, Daphne discovers just how uninformed she is about the physical aspects of the marital bed. Colin comes to a decision about Marina.